So I was playing Deniable Ops alone, and as always I got detected on Hunter mode so I just decided to retry it but I can only do that by letting the guards kill me so anyway, I am detected my sillhoutte appeared, then I went into the light the guards killed me, waiting 2-4 second, there it is LEVEL 3 Vanish Silently P.E.C Challenge won....Now I am happy but not happy because I did not earn it correctly.

UBISOFT GET MORE TESTERS AND DO ALL THE ACHIEVEMENTS 10 TIMES BEFORE MAKING THE GAME!!! http://forums.ubi.com/groupee_common/emoticons/icon_smile.gif